Study on Maxillary Triangle
1983 Volume 4 Issue 1 Pages 31-38
Details
1983 Volume 4 Issue 1 Pages 31-38
The purpose of this study was to measure and to analyze the form and the size of human maxillary triangle. Furthermore, the designs regarding to the intercondylar distance of the articulators were evaluated in comparison with those of the human maxillary trianle.
30 Japanese adults, consisting of 15 males and 15 females, with ages ranging from 20 to 40 were selected. The qualifying criterion was that their maxillomandibular relation be orthognathic.
Prior to the measurements of maxillary triangle, hinge axis location and hinge bow transfer, were performed.
The distance between left and right stylus and the distances between left stylus and right stylus and maxillary incisal point were determined with the measuring device.
The results of measurement were summarized as follows.
1. The average face width of the male group was 15.3 cm. The average distance of skin to incisal point was 12.4 cm on the right and 12.3 cm on the left.
2. The average face width of the female group was 14.4 cm. The average distance of skin to incisal point was 11.6 cm on the right and 11.3 cm on the left.
3. The average face width of 30 adults was 14.9 cm. The average distance of skin to incisal point was 12.0 cm on the right and 11.8 cm on the left.
Based on those results, maxillary triangles of the group was obtained by subtracting 4.6 cm from the facial width. The distance of condylar point to incisal point was determined by geometrical means.
4. According to the results, the average intercondylar distance of the male group was 10.7 cm. The average distance of condylar to incisal point was 11.1cm on the right and 11.1 cm on the left.
5. The average intercondylar distance of the male group was 9.8cm. The average distance of condylar to incisal point is 10.3 cm on the right, and 10.1 cm on the left.
6. The average intercondylar distance of all the group was 10.3 cm, the average distance of condylar to incisal point is 10.7 cm on the right, and 10.6 cm on the left.
7. The shape of maxillary triangle was considered to be isosceles triangle, however, definite conclusion concerning the average size and shape of human maxillary triangle could not be made due to lack of the number of the group. Tremendous number of the group may be needed for this type of study.
8. The intercondylar distance of articulator most suitable to provide was 10.5 cm as far as the anatomical mean value of intercondylar distance was concerned.
